• Title/Summary/Keyword: fiber grating fabrication

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Fabrication of a Multiplexing Sensor Probe for Measuring the Blade Deflection of a Wind Power Generator (풍력발전기 블레이드 처짐 측정을 위한 다중화 센서 탐촉자 설계 제작)

  • Kim, Ji-Dea;Lee, Dong-Ju
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.2
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    • pp.178-185
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    • 2014
  • This paper describes a fabrication multiplexing sensor probe that employs a fiber Bragg grating(FBG) based on multiple measurements to determine the blade deflection of a wind power generator the reliability analysis of this probe is also presented. To diminish the temperature sensitivity of the FBG sensor, we form multiple CFRPs onto the upper and lower layers of the FBG and package it with an epoxy resin. As a result, the depth of the CFRP is 1mm, and the temperature sensitivity is $2.39pm/^{\circ}C$. We construct a sensor network utilizing the fabricated sensor with a blade beam model. As the number of pendulums is increased on the fore-end of the beam, the strain value is measured. The strain variation is calculated from the measurement of the load on the blade beam model by monitoring the strain of the FBG sensor. When the linear equation is applied, the strain error is 0.4% and when the finite difference method is used, the tip deflection error is 3.3%. The displacement error derived from the strain value of the FBG sensor is 4.39%. The calculated result between the measured value of the dead-end of the beam and the strain is less than 2.46% tip distortion error. Therefore, our proposed multiplexing sensor probe is a low-cost and high-reliability solution for a commercial wind power generator.

Fabrication and Characterization of $1.3{\mu}m$ RWG-DFB-LD for Optical Fiber Communication (광통신용 $1.3{\mu}m$ Ridge Waveguide Distributed Feedback Laser Diode의 제작과 특성 평가)

  • 박경현;이중기;장동훈;유지범;강승구;김홍만;이용탁;박형무;조호성
    • Korean Journal of Optics and Photonics
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    • v.5 no.1
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    • pp.113-119
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    • 1994
  • We fabricated and characterized RWG-DFB-LDs emitting at $1.3\mu\textrm{m}$ wavelength. For fabrication of the laser diode, inteference fringe of optical beams was used for grating formation and epi layers were grown by LPE. The fablicated RWG-DFB-LD operated in a single longitudinal mode with more than 30 dB SMSR at 1296.5 nm emitting wavelength and its threshold current was 67 mA. Coupling coefficient (K) was estimated as $40cm^{-1}$ by means of stop-band measurement. Finally, we show that the RWG-DFB-LD fabricated in this experiment can be applicable as light source of 2.5 Gbps optical communication system from the fact that the small signal response of the RWG-DFB-LD rated up to 1.99 GHz at pre-bias level of $1.2 I_{th}$..

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